Bay Area ZX80/81 User's Group (BAZUG) Newsletter 1:6 Nov 1982

BAY HReEn

BAZUG meets for the first time
at the West Branch of the Herkeley
Bay, Library located near the
corner of University Avenue and San
Fablo Avenue Thursday, November 18.
Take the Herkeley exit of
Interstate 80 and head towards the
University. The meeting will

start at 7:30 pm and end at 9:30
pm. A small rental fee will be more
than off-set by the spacious
accomodations. Tables, chairs, a

kitchen, and electric outlets will

be available. (You may wish to
bring an extention cord.) Messages
can be received during the meeting
on the West Branch phone (415 644
6870) and a pay phone is located
directly outside the Library for
out-going calls. Parking is

generally not a problem by 7:30 pms
use either side of University
Avenue. SEE YOU THERE!

SOFTWARE REVIEWS 20. 5 00 46 a.

QUEST by Aardvark
Reviewed by Joel Brody
This
illustrates

adventure program
the best and the worst

of software (and other products)
available for the Sinclair/Timex.
We know the latent ability the
machine has for first-class game
playing. Its main hindrance being
the low resolution graphics
Capability. Adventure games are my
main interest in recreational

computing 50 I was quite excited by

Aardvark’ s ad in Syne. On seeing
the game that excitement was
enhanced by fine game concept and a
good use of the ZX81*s graphic
capability. However, that

excitement turned to frustration by
Aa game that was only 98% complete.

Quest puts you on a map of
Alesia where you have to wander
finding hidden caves, castles, and
riutins while searching for treasure:
and recruits. These resources are
necessary to conquer the citadel of

aya

@eeea

~NEW LOCATION!

The game should take from

Morlock.
two to five hours. It plays nicely
and is quite interesting . . .« when
it doesn*t crash. In fact, I have

never been able to complete a game
without this program crashing.
This company creates software for
other computers and is adapting
some of these programs for use oan
Sinclair/Timex equipment. Te is
clear that Quest was not properly
play-tested before marketing.
Another problem was that the

program came without an instruction
sheet. It was challenging and
interesting figuring out the rules,

but ait is another mark against
Aardvark’s professionality.
Aardvark has promised to send

instructions as well as a corrected

game but they have been slow in
doing this.

The popularity of the
Sinclair/Timex is inspiring many
new, small businesses to produce
software and hardware. From the
look of the ads and a few of the
products I*ve seen the quality of
the merchandise varies greatly.
Since most of the products are only
available by mail the upgrading and

feeding of our computers is a risky

business at this time.

BAZUG | bn

654 4O™ ST. .
RICHMOND, CA.
94305

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Connector to Sinclair port with right angle bend on pins

Jim March
32\6 Partrid
| Oaklan 1d, CA.

$7

Enter or list machine code in hex or decimal and

and keyway insSert....eeseeeccescccnccccecerecccreccs

a

character code. With editing. Fits

display address and

Program.

By Steve

Listing and instructions.

machines.
Ngee c cece cece ccc e cee c reece cerecsccesscseeesssces

on one K

$3

Ave.
G4 On5

chip.

meter,
Written

ber .cscocceseeS?

& controller. 32 pages.

Projects using the 8255 port
by Scott Vanderlip. Available late octo

text, and programs for digital volt

counter,

booklet.

Schematics,
digital scope,

Applications

Repairs for ZX81/TS 1000.......-ece cece rere eee es S20 + parts.

PLEASE INCLUDE $3 MINIMUM for SHIPPING & HANDLING.

for sales tax.

Prices and availability are subject
ice.

nclude &%

ents please
are prompt.

res

Deliveries
to change without advanced not

information

COMPUTER CONTINUUM.
and

Marketing proposals

Continuum.
exchanges are encouraged.

order send check or money order to
the

COD ORDERS accepted.

To
Join

of

d to our knowledge all

We have sold hundreds of boards an
our customers have been satisfied.

ATE? Feet
Review by

S AO On ten
‘tchard Link

Sinclair has made ai quiet
entry into the video Game arena.
Space Raiders is the ZX version of
Space Invaders (designed by Fsion).
Tt looks and moves like the
beginning levels of the Atari Game
version, minus saund and color.
There seems to be plenty of room
left in RAM for future
improvements. Loading time for
this machine code program is a

scant 1 minute SO seconds. Romber ,
the flip side of this program, has
proved to be my favorite of the

two. Tt also has a short loading
time leaving room for future
improvements. The object is toa

totally destroy a city as many
times as you can with your bombs

and rockets as you get closer and

closer to the ground. This.
procedure repeats until you finally
crash or catch yourself in your own
missle fire. Roth games are

available on one cassette for $8.95

plus shipping. Both offer more

than what could be programmed in 1k

or 2K and should be entertaining

for most children. T would mot

recommend these as diversions for

adults interested in heavy duty 2X

software.

Seen any new Sofware or hardware
lately ? You ae invited to review
any and all products for the Time

al may prosper,
OOOO CIO OIOIOIOIOI IOI IOIOIOIOI I IOI IOI
( ) SOFTWARE, ( ) HARDWARE REVIEW

Item

Discription of purpose

KVaiTablp IRFGGGRERE sO a eS

Personal Evaluation

ARY AREA 2XB0/A1 USER'S GROUP
-profit omanizaton servinc
ste bed tines Woes unece: Ae
PRESIDENT — JIM MARCH
TREASURER —- GRUCE BUCHANAN
EDITOR AND

SECRETARY — RICK LINK

Please send all articles, questions, adver-
tisements to the editor:

54 4OTH Sy,
an Bicdm ND, &. aye0s

ALL TRAVE MAQKE, E1C,, ACL PROTECTEL.L IC,

NEW PRODUCT ANNOUNCEMENT
Computer Continuum has announced
that its ANALOG INTERFACE for the
Timex/Sinclair computers and other
8 bit machines is about to be
introduced. They should be
available after Dec. Use. 182s
Features includes

axGB channels of analog to
digital conversion

4x8 channels of digital to
analog conversion

4x8 bits of resolution

Kka fast 2.0 microsecond
conversion time

xkmnemory mapped or I/0 mapped,
switch selectable

~call channel by memory
or 1/0 address

Kxkreceives power through
computer’ s 9. volt unregulated
line

4xXthe portion of the memory or
1/0 map the which the
converter responds is switch
selectable

¥kaccomodations are included
for easy interfacing to most
microcomputers

Assembled and tested unit: #20
ICDitiderehwholaleralaequinie tetaicietsl eieieta cme oe

“Write software for the Analog

Interface and GET ROYALTIES

ROBOTE K eee

Computer Systems

10545 B SAN PABLO
EL CERRITO, CA 94530
(415) 524-3730

Computer Typesetting was accomplished with the aid of Tom Kilpatrick
on one of his computers at Rogotek. Anyone interested in

al +he newsletter get out on time vorunteer' We need
ee programs, reviews, helpful hints; whatever you have!
hake arity

fits

o§
oe
as
yo
YQ) <<

Here is what the Computer Continuum Expansion Board gives you:

Rex Humbara

etc.
Foundation, Gulf Oil Communications, Alderman Studies, Veterans Admin-

These Buffers are like digital amplifiers which allow up to 10 peripherals to simultaneously
interface the computer (as opposed to 3 otherwise). You can construct and develop peripherals

while the computer is on with little fear of damaging or crashing the system. All lines except
Reset and Busrequest are buffered. The Data buss is bi-directionally buffered. An optional

jumper is provided to connect the Busrequest line to the buffer “‘enables’’ to allow Direct
mands (1/O mapping recuires a machine language subroutine POKEd in and called with a USR
command). The ROM in the ZX80/81 repeats itself at addresses BK to 16K. The Expansion

Full documentation. Pian for memory mapped programmable !/O port, RAM plan and sample

Program is included. Here is your chance to learn about computer /digital electronics!
Other computers. We have used the Expansion Board 2s a development system on other Z80

inch spacing, for jumper headers and ribbon cable to attach to marketed peripherals. 1 set of
Memory mapping a peri:heral allows much easier programming with the PEEK and POKE com-
CPU type computers. So can you!

fingers to accomodate the 16K RAM pak.

An extra BK of addresses for you to use for more memory or memory mapped peripherals.

Board prevents this by sending a signal to the ROM Chip Select (ZX80 users are given full in-

structions to add a wire at ROM CS).
can be removed from it: case and mounted vertically as a card. If you add a real keyboard

Optional vottage reguistor. Jumper wires allow you to choose which regulator powers what
Finest quality board: double sided, plated through holes, legend, solder mask, tin plated,
Mounting Option. The ZX81 has an alternate mounting to the Expansion Board. The ZX81
the Expanded ZX becomes a more meaningful system. To take this option you only need
to ask for the appropriate connector when ordering the Expansion Board (no extre charge).

0.156 inch spacing; available from Redio Shack or Vector. Room for wire wrap. 2 siots at 0.1
gold over nickel plated fingers. Board securly fastens to ZX81.

Memory Access Works with 1/0 mapped ports. The buffers are arranged so that

any line can easily be unbuffered.
Works with ZX 16K RAM and other 16K RAMS, ZX printer, micro Developments boards,

Buffered buss including all the lines from the ZX80/81 expansion port.
Connector slots to interface to existing or user built peripherals.
onto Memoteck’s 64K RAM and other products. 4 slots for experimenter cards; 44 pins at

é
z a 3 Sa cg) 4S

—

Drysdale Securities Corp,

=

Purdue, University of California,
FAIRCHILD Weston, Northrop Corp, Harman-Motive, Argonne National

Texas Tech, University of Oregon, Stevens Institute of Technology,
Laboratories, Questor Corp, Microcomputer Systems Corp, Lang Systems Inc,

Georgetown University, Henderson State University, San Prancisco

istration Center Medical Research Office, Institute of Gas Technology,
Henderson DeSilvey and Assoc Inc, Murdoch Engineering Inc. anc many others.

Some of the universities that are using the Computer Continuum Expansion

The following companies have used the Expansion Board as a development

5 -

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